Alarm signal



June 16, 1931.

Fig.1.

- M. J. DAV1S 1,810,162

ALARM SIGNAL Filed Feb. 5,1950

g3 15 2 a 77 5 K J6 J5 21 INVENTOR I Whihael J. .Ucurzs 83/64 ffromavg Patented June 16, 1931 MICHAEL J. DAVIS, 0F

PATENT 0F FICE BROOKLYN, NEW YORK ALARM SIGNAL Application filed. February This invention relates essentially to an audible signal which gives an alarm by blowing a whistle at predetermined intervals 10 the device can be fixed to a post or similar support when used outdoors or positioned on a wall in a dwelling.

Another object of the invention is to house all the operating parts with the exception of rotor shaft into an outlet tube communieating with a whistle or other sound producer.

Another object of the invention is to increase or decrease the Volume of the sound by gradually'opening or closing the fluid outlet and at the end of the stroke entirely shutting off the fluid thus momentarily stopping the alarm.

The invention resides more particularly in the novel combinations hereinafter described and claimed, reference being made to the accompanying drawings in which:

Fig. 1 represents a vertical section of a device embodying this invention.

Fig. 2 is a detail section taken along the line 22 of Fig. 1.

In the drawings the numeral 5 designates a casing or box having a cover 6 made to close thebox. The box is provided with an opening 7 to suck air into the box and an opening 8 located in the cover permits the air to escape. The cover also has asmall vent or opening 9 above the other 0 ening to at times allow the air to escape. n the nipple of the opening 7 is arranged a sound producer such as a whistle which is similar to those used by policemen to sound an alarm. The Whistle can be connected to the nipple by means of a flexible tube or otherthe whistle in the casing so that when used 3, 1930. Serial No. 425,606.

wise, and'placed at any distance from the box. The box can be secured to a wall in a building or it could be used outside of the building to sound an alarm or direct street traflic. I

In the box is secured anrelectric motor 11 having a rotor shaft 12 and leads 14 connect the motor toa source of electricity such as a socket or outlet box by means of a plug at the end of the leads, not shown. On the shaft of the motor is fixed a fan having radial blades 15, and a pinion 16 on the shaft rotates with the fan when the motor is energized. The pinion engages a gear wheel 17 mounted on a counter shaft 18 secured to the casing. The counter shaft carries a grooved cam "19 fixed to the gear and rotating therewith.

In order to control the air forced into the outlet tube 8 a slide valve 20 is provided.

The valve is actuated in a rectilinear reciprocating path to open or close the said outlet by means of an arm 21 having a roller 22 coacting with the groove in the cam. When the motor is energized the fan sucks the air into the opening 7 and forces it out of the opening 8 located in the cover. When the opening 8 is closed by the slide valve theair generated by the fan is diverted out of the small vent 9 in the cover. is closed by the slide valve when the outlet 8 is opened. The cam is gearedto rotate about one-half as fast as the fan thereby transmitting uniform rectilinear motion to the slide to prolong and-gradually increase I claim: I 1. An alarm signal comprislng a casing The vent the sound in simulation of a distress signal.

having a fluid inlet and a fluid outlet, a

motor secured in the casing provided with a rotor shaft, a fan mounted on the shaft, a signal communicating with the outlet, means actuated by the rotor shaft for increasing or decreasing and momentarily shutting ofi the volume of the fluid forced into the outlet by the fan, and a vent located in the casing brought into action when the outlet is closed to expel the fluid vgenerated by the fan. 2. An alarm signal comprising a casing having a fluid inlet and a fluid outlet, a motor secured in the casing provided With a rotor shaft, a fan mounted on the shaft, a signal communicating With the outlet, a pinion on the rotor shaft, a gear engaged by the pinion, a cam actuated by the gear, and a slide operated in a rectilinear path by the cam to open or close the inlet.

3. An alarm signal comprising a casing having a fluid inlet and a fluid outlet, a motor secured in the casing provided With a rotor shaft, a fan mounted on the shaft, a signal communicating with the outlet, a pinion on the rotor shaft, a gear engaged by the pinion, a cam actuated by the gear, a slide operated in a rectilinear path by the cam to open or close the inlet, and a vent located in the casing opened by the slide valve when the outlet is closed to eject the fiuid generated by the fan.

In testimony whereof I have hereunto set my hand.

MICHAEL J. DAVIS. 

